a-a a-b a-i aaa aab aae aag aai aap ab- aba abb abe abg abi abp aea aeb aee aeg aei aep ag- aga agb age agg agi agp ai- aia aib aie aig aii aip ap- apa apb ape apg api app b-p baa bab bae bag bai bap bba bbb bbe bbg bbi bbp be- bea beb bee beg bei bep bga bgb bge bgg bgi bgp bi- bia bib bie big bii bip bpa bpb bpe bpg bpi bpp eaa eab eae eag eai eap eba ebb ebe ebg ebi ebp eea eeb eee eeg eep ega egb ege egg egi egp eia eib eie eig eii eip ep- epa epb epe epg epi epp g-p gaa gab gae gag gai gap gba gbe gbg gbi gbp ge- gea geb gee geg gei gep gga ggb ggg ggi ggp gia gib gie gig gii gip gpa gpb gpe gpg gpi gpp ia- iaa iab iae iag iai iap iba ibb ibe ibg ibi ibp ie- iea iee ieg iei iep iga igb ige igg igi igp iia iib iie iii iip ipa ipb ipe ipg ipi ipp p-p paa pab pae pag pai pap pba pbb pbe pbg pbi pbp pea peb pee peg pei pep pga pgb pge pgg pgi pgp pia pib pie pig pii pip ppa ppb ppe ppg ppi ppp